Method getValueAccessorByIndex

src/base/stack-mixin.js:184–186

(index)

    }

    getValueAccessorByIndex (index) {
        return this._stack[index].accessor || this.valueAccessor();
    }

    yAxisMin () {
        const m = min(this._flattenStack(), p => (p.y < 0) ? (p.y + p.y0) : p.y0);